TransactionAwareDataSourceConnectionProvider


1   /*
2    * Copyright 2002-2005 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.orm.hibernate3;
18  
19  import javax.sql.DataSource  ;
20  
21  import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
22  
23  /**
24   * Subclass of LocalDataSourceConnectionProvider that returns a
25   * transaction-aware proxy for the exposed DataSource. Used if
26   * LocalSessionFactoryBean's "useTransactionAwareDataSource" flag is on.
27   *
28   * @author Juergen Hoeller
29   * @since 1.2
30   * @see LocalSessionFactoryBean#setUseTransactionAwareDataSource
31   */
32  public class TransactionAwareDataSourceConnectionProvider extends LocalDataSourceConnectionProvider {
33  
34      /**
35       * Return a TransactionAwareDataSourceProxy for the given DataSource,
36       * provided that it isn't a TransactionAwareDataSourceProxy already.
37       */
38      protected DataSource   getDataSourceToUse(DataSource   originalDataSource) {
39          if (originalDataSource instanceof TransactionAwareDataSourceProxy) {
40              return originalDataSource;
41          }
42          return new TransactionAwareDataSourceProxy(originalDataSource);
43      }
44  
45      /**
46       * This implementation returns <code>true</code>: We can guarantee
47       * to receive the same Connection within a transaction, as we are
48       * exposing a TransactionAwareDataSourceProxy.
49       */
50      public boolean supportsAggressiveRelease() {
51          return true;
52      }
53  
54  }
55
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags